精妙SQL语句

ldhy

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说明：复制表(只复制结构,源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
说明：拷贝表(拷贝数据,源表名：a 目标表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
说明：显示文章、提交人和最后回复时间
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
说明：外连接查询(表名1：a 表名2：b)
SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c
说明：日程安排提前五分钟提醒
SQL:  select * from 日程安排 where datediff(&#39;minute&#39;,f开始时间,getdate())>5
说明：两张关联表，删除主表中已经在副表中没有的信息
SQL:  
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
说明：--
SQL:  
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
  FROM TABLE1,
   (SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
       FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
               FROM TABLE2
             WHERE TO_CHAR(UPD_DATE,&#39;YYYY/MM&#39;) = TO_CHAR(SYSDATE, &#39;YYYY/MM&#39;)) X,
           (SELECT NUM, UPD_DATE, STOCK_ONHAND
               FROM TABLE2
             WHERE TO_CHAR(UPD_DATE,&#39;YYYY/MM&#39;) =
                   TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, &#39;YYYY/MM&#39;) || &#39;/01&#39;,&#39;YYYY/MM/DD&#39;) - 1, &#39;YYYY/MM&#39;) ) Y,
       WHERE X.NUM = Y.NUM （+）
         AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B
WHERE A.NUM = B.NUM

说明：--
SQL:  
select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名称=&#39;"&strdepartmentname&"&#39; and 专业名称=&#39;"&strprofessionname&"&#39; order by 性别,生源地,高考总成绩

说明：
从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源）
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, &#39;yyyy&#39;) AS telyear,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;01&#39;, a.factration)) AS JAN,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;02&#39;, a.factration)) AS FRI,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;03&#39;, a.factration)) AS MAR,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;04&#39;, a.factration)) AS APR,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;05&#39;, a.factration)) AS MAY,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;06&#39;, a.factration)) AS JUE,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;07&#39;, a.factration)) AS JUL,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;08&#39;, a.factration)) AS AGU,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;09&#39;, a.factration)) AS SEP,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;10&#39;, a.factration)) AS OCT,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;11&#39;, a.factration)) AS NOV,
     SUM(decode(TO_CHAR(a.telfeedate, &#39;mm&#39;), &#39;12&#39;, a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
       FROM TELFEESTAND a, TELFEE b
       WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, &#39;yyyy&#39;)

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